5. Where were you when Britney and Madonna kissed on the lips? (2003)

It's something that people would most probably think nothing of in 2014, but in 2003 when Madonna (who was playing a groom) kissed her brides (Britney Spears and Christina Aguilera) in 2003, the world stopped. Unfortunately for Christina, she went second, so it's mostly known as 'the moment Madonna kissed Britney.'